Bosses

The Thorium Mod expands on the number of bosses that can be challenged at different points in the game, featuring unique drops and AI, making every encounter a memorable one. Most bosses do not spawn naturally on their own, and thus require their respective boss summoning item to initiate the fight.

Defeating these bosses are not required for game progression, but may be beneficial as they can provide useful items and access to new Town NPCs. Defeating The Ragnarök, a post-Moon Lord boss, grants new end-game equipment that overpowers some of the vanilla end-game content twice over.

Similar to vanilla Terraria, players that are under prepared may find bosses challenging, and players that are over prepared may find the boss fight too easy. Hence it is up to the player's discretion to adjust the angle at which they tackle the different bosses, ensuring they are able to enjoy fighting them to the best degree.

The Grand Thunder Bird is a tan and turquoise feathered bird with 1,000 health (1,800 in Expert Mode). It is summoned with a Grand Flare Gun using Storm Flares during the Day in the Desert. It has a delayed charge attack that can be halted with a melee strike, and will also summon Hatchlings, create storm clouds over the player's head that rain down tornado-inducing lightning bolts, and utter loud cries that bring down bolts of energy from the sky. It is considered the easiest boss in Terraria, but may still prove a challenge to unprepared players. Defeating The Grand Thunder Bird is required for the Desert AcolyteNPC to move in.

The Grand Thunder Bird drops lightning bird-themed weapons and accessories, as well as Sandstone Ingots, an early game crafting material. It also drops the Talon Burst in Expert Mode, a ranged weapon that turns wooden arrows into rapid, double-hitting storm bolts.

The Queen Jellyfish is a large pink jellyfish that has the DivermanNPC entrapped in its head. It has 4,000 health (6,600 in Expert Mode) and is summoned with a Jellyfish Resonator while the player is standing in water at the Ocean, but can be fought anywhere nearby afterwards. It summons various types of Royal Jellies to attack the player while launching bubbles that send the player high into the air. It will also outstretch tentacles to attack the player in Expert Mode when it loses enough life. Defeating The Queen Jellyfish causes the Diverman NPC to drop right out of its head, and enables him to move in to an available house.

The Queen Jellyfish drops a variety of jelly-themed weapons, as well as Pink Gel which is otherwise an item dropped from the rare Slime, Pinky. It also drops the Sea Breeze Pendant in Expert Mode, an accessory that grants several improvements to the player when they are underwater.

The Granite Energy Storm is a large granite core surrounded by energy. It has 7,250 health (9,000 in Expert Mode) and has to be summoned with the Unstable Core in the Cavernlayer, but can be fought anywhere afterwards. It uses a slightly delayed charge attack on the player while generating a circle of Coalesced Energy around itself, absorbing many of the player's attacks; this energy will then break off from the circle and home in on the player once seemingly destroyed. It will refresh its energy eventually if it is lost, and will also begin to launch energy balls from its core as it loses life, which deal high damage.

The Granite Energy Storm drops energized granite-themed weapons, as well as the Eye of the Storm in Expert Mode, an accessory that releases damaging energy which homes in on enemies.

The Buried Champion is a boss which resembles a winged Greek warrior. He has 7,250 health (9,500 in Expert mode) and has to be summoned by killing a Bizarre Rock Formation in the Marble Caves or by using the Ancient Blade in the Cavernlayer. It will start out by using its blade to charge at the player, launch wind slices, and summon daggers from above. As it loses health, it will switch to using its bow, firing regular and elemental arrows at the player; and for its final phase will use its staff to fire volatile magic orbs while also summoning invulnerable echoes of itself to assist it. Defeating The Buried Champion is required for the SpiritualistNPC to move in.

The Buried Champion drops Greek bronze-themed weapons and accessories, as well as the Champion's Wings in Expert Mode, which are the best possible wings accessory available before Hardmode.

The Star Scouter is a large alien saucer which attacks with a series of purple lasers and beams. It is summoned with a Star Caller which can only be used in the Space biome. It has 8,200 health (10,000 in Expert Mode) and is the most difficult boss before the Wall of Flesh. It will start out by using a vertical laser beam attack that creates horizontal energy waves when contacting a tile. It will add new attacks to its pattern as it loses life, including singular bursts of energy, homing graviton surges, and triplet energy beams. In Expert Mode, it also gains an unstable energy orb attack and at 25% life will release three Scouter Cores which attack the player and must be defeated for the fight to continue.

The Star Scouter drops meteoric, space-themed weapons, as well as the Omega Drive in Expert Mode, which summons a pet that can attack enemies.

The Borean Strider is a boss that spawns randomly in the Snow biome during a Blizzard. Its spawn may be expedited through use of a Strider's Tear. It has 16,250 health split over 2 phases (19,500 in Expert Mode). It leaps at the player, creating shockwaves as it lands, and shoots icicles at the player with increasing frequency as its health depletes. It also releases waves of snow and spawns Borean Hoppers and Borean Mytes during its second phase. Its attacks also inflict various ice-themed debuffs upon players.

The Borean Strider drops frost-themed weapons, as well as the Ice Bound Strider Hide in Expert Mode, an accessory that provides bonuses to players using weapons that inflict the Freezingdebuff. Upon its defeat, new enemies will begin to spawn in underground Spider Nests.

Coznix, The Fallen Beholder is a cephalopod-like boss that is summoned by consuming the Void Lens. It has 12,000 health (23,000 split over 2 phases in Expert Mode). It attacks with eradication beams and charge attacks at first. After losing 20% of its health it will begin to unleash a large spread of dark magic that debuffs the player but deals no damage. Sometimes it will summon Enemy Beholders to assist it. After losing 65% of its health it will begin to summon slow moving void gates that shoot powerful laser beams directly downwards.

Upon defeat in Expert Mode, its second form will be released. As well as ramming into the player more often, it will unleash eradication beams and void gates far more quickly, and many of its attacks inflict a damaging burn on the player.

Coznix drops infernal, demonic-themed weapons and accessories, as well as the Beholder Staff in Expert Mode, a summon weapon that calls forth Mini Beholders to blast energy at enemies. Upon its defeat, Lodestone Chunks and Valadium Chunks will generate throughout the world; this can happen up to three times per ore with each successive defeat.

The Lich is a skeleton-like boss summoned with the Grim Harvest Sigil. It has 18,500 health (29,000 split over 2 phases in Expert Mode). It rapidly fires flaming lasers from its eyes, rains down giant fireballs and spawns a bolt that stagnates mid-air or on tile impact.

Upon defeat in Expert Mode, it will turn into The Lich (Unmasked). In this form it rushes at the player with high speed and damage, shoots projectiles from its scythe, spawns colossal burning spirit balls and spawns the Phylactery of a Thousand Souls, which will fortify its defense greatly until it is killed.

The Lich drops deathly, soul-themed weapons and accessories, as well as Cursed Cloth, a crafting material that is used to make Lich armor. It also drops the Lich's Gaze in Expert Mode, an accessory that can grant temporary guaranteed critical strikes for throwing weapons.

Abyssion, The Forgotten One is a crab-like boss fought in the Aquatic Depths. It has 46,000 health split over 2 phases (81,000 split over 3 phases in Expert Mode). The Forgotten One has multiple attacks that become more numerous and frequent as its health depletes. Once seemingly defeated, the boss enters its second phase in which it has all of its attacks from the first but with added frequency and damage, and a new dark wave attack.

In Expert Mode, Abyssion has a third and final phase in which its attacks become imbued with dark magic and it moves much faster, attempting to ram the player with incredible speed.

Abyssion drops aquatic, abyssal-themed weapons, as well as the Abyssal Shell in Expert Mode, an accessory that can grant invulnerability at the cost of movement, life regeneration and attack capability.

The Ragnarök is the final boss of the Thorium mod, summoned with the Doom Sayer's Coin. It consists of three bosses: Aquaius, The Endless Tide; Omnicide, The Life Defiler; and Slag Fury, The Primordial Flame; each having their own set of attacks and forms. In total, the encounter has 462,000 health split over 3 bosses and several phases (793,000 split over 4 bosses in Expert Mode).

If any of them are defeated in Expert Mode, whilst at least one is still alive, the defeated boss will turn into an elemental and attack the player till all of them are defeated, at which point, the final phase of the fight will begin.

The Ragnarök, when fully defeated, drops the three Primordial Essences, crafting materials used to make the most powerful gear available in the mod. It can also drop three unique items in Expert Mode: The Omega Core, an accessory that grants incredible speed; the Bow of Light, a rare true weapon with an extremely powerful charge attack; and the Dormant Hammer, which is used to craft the ultimate weapon of the mod, Mjölnir.

Patch Werk is a mini-boss found during a Blood Moon. It has 425 health (850 in Expert mode). Patch Werk slowly moves towards the player while spawning Blood Drops and Severed Legs when attacked. In Expert Mode, it will also use a damaging shockwave attack that summons Zombies and Famished Maggots.

Corpse Bloom is a mini-boss that can be found rarely in the Underground Jungle after Skeletron has been defeated. It has 950 health (1900 in Expert Mode). It walks toward the player, attempting to attack them with its mouths. It also occasionally summons Corpse Petals.

When killed, the Druid will be able to move in when there is sufficient housing. It will also drop the Bloom Guard, a Healer support staff that can increase the defense and life regeneration of players affected by it.

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